Apparatus for cutting teeth in hand saws



July 11, 1950 B. G. DAGGETT APPARATUS FOR CUTTING TEETH IN HAND SAWS INVENTOR. Egmdfiaggefi 2 Shee ts-Sheet 1 2 Q 1 m u G QM mw mw in? Q Q MQ N@ .1

Filed May 14, 1947 QTTOENEV y 1950 B. G. DAGGETT 2,514,567

APPARATUS FOR CUTTING TEETH IN HAND s ws Filed May 14, 1947 Z-Sheets-Sheet 2 'M wwm w .ma 1 m m IN V EN TOR.

arrow/5r Patented July 11, 1950 UNITED STATES F F I CE ABPARATU'S FOR CUTTINGlTEETHlN HAN D SAWS Byron GJDaggett, San Diego,Calif.

."ApplicationMaylri, 1947,..SerialNo. 742907 l'5'Claims. (Cl.'76.29)

mechanic or otheruser of -.the saw; toiaccomplish the cutting of theteethina.minimumramount of time consistent with accomplishing-thebest,re- .sults; to render'the parts readily accessiblesforiinspection, adjustment, replacement, restorationcor repair and generally to provide an apparatus which is economical ofconstruction,tefiicientiin action and of prolonged lifeand durability. vMy invention further consists .of .other novel features of construction, ,and combinationsandlarrangements of parts, illustrated in the drawing and hereinafter more specifically described and claimed.

Attention is hereby directed to the idrawinglillustrating a preferred form of my invention,=in which similar numerals of designation refer .to similar parts throughout the several views, and in which,

Figure 1 is a plan View of a preferred form :of apparatus embodying :my invention showing the track and carriage .mounted thereon, c upon which carriage the sawxiseshown to be .attach'ediinoperative position; the punch mechanism .for cutting the teeth of the sawvand' adjacent mechanism alsobeing shown:

Fig. 2 is a front elevation ofaportion of theapparatus shown in Fig. 1, looking at-thesamelinthe direction of'the arrows2-2;

Fig, 3 is an enlarged detail plan vieyshowing the frictional clamping :means :for slidably holding'the carriage in its progressronithe track, in, unclampedposition;

Fig. 4 is a lateral sectionon line 4-4 of Fig. 1,, looking .in the direction of the arrows;

Fig. 5 is a section on line 55.of.Fi g '4, looking in the direction of the arrows;

Fig. 6 is a section onlineG-fi ofFig. 4, looking in the direction of the arrows;

Fig. '7 is a section of Fig. 5.on,line v'l'l, looking in the direction of the arrows, and

Fig. 8 is a section on line 8-18 OflFigjEiloOking in the direction ofithe arrows.

Referring to the drawing, secured-tothelbed or foundation 9 is the hollow casting lathe-body of which is rectangular inform and toiwhichiis secured the extension ll preferablyintegral .therewith. Mounted upon the casting land secured thereto'by means of cap crews J2is the plate 13.

Firmly attached to the plate [3 by any suitable means are therails l5, l6 and ll of the-track l8. 'Slidablymounted .upon' thetrack l8 is the carriage l9, comprising-thelflat longitudinal-member '29, having integralztherewiththe laterally extendingarms 2 I 22. and zsgthetends of which'are respectively welded or otherwisesecured to the strip 24. .FOI the purpose -7cf'securing the "sawto the -.carriage,,-I provide the clamps 26, 21 and 28 which rareradjustably mounted uponthe arms-2| 22 and 23,.respectively. For the purpose of maintaining the tracks lfi and H in proper alignmentgl, provide-the ties -25 *and -25a the ends of which are tsetoured thereto bymeans ofzcapscrews 25b.

Resting ,within :the recess :29 "formed 'between the "ties =39-and 3!, welded to the member 20, is :the .ind-exrbar 32, whichindexbar is provided with 'iequalli Spaced teeth 33.

This index bar is for the purpose of brin gin-gabout the required spacing ofrnewteeth of. the saw-.formed'in-themanner hereinafter described sandnlay be interchanged withiotherbars with: different spacing of the teeth ifcdesired. Longitudinal movement of thebar 32 is vprevented by the stop 34 at the 'end of the .25 recess '29.

-Pivotally zmounted upon longitudinal member Zllby means ofv machine screws 35 are the :clamps 36 releasably .in engagement with bosses 36a on said member, and downwardly depending from each of said.- clamps andpreferably:integraltherevwith is-a'shoefil in sliding contact with one side ofrrail 1.6; a compression spring 38 attached to one end iof each clamp and also to the member '20, serving normallyto keep eachvshoe 3'! in yielding sliding engagement with track '55 as shown in Fig. 1. Preferably secured to :the underside of member 20, opposite to each of the clamp 36, and in sliding contact-with the oppositeside of the track l6, are the shoes39 forming a rigid part of the structure of saidlrnember it (see Fig. 3')

.Mounted upon thelcasting i!) are the bearings 4 0 and and .journalled :within said bearings .is theeshaft lz, to-whichis firmly attached'one end of the rockerarm :43; the otherendof said 'arm being secured by the connecting "rod 44 to *-'the crankshaft .45 by means of =crankp-in 46. The periphery-of said crankshaft -45 is contoured to form theicam t! positioned to engage with the cam #011448 upon 011i11d-0f the stripper arm 49, the .other .end of which is mounted to oscillate upon .theshaftlz. Alsoas shown thessaid stripper arm-A9 :is provided with J the extension having the -finger .5! located to make vrigid contact with the face of saw and extending forwardly and upwardly from the rocker arm 43,-.is the As shown in Fig. 1 of the drawing, the main 1 portion of crankshaft 45 is journalled in hearing 58 on extension H, and connected with the outer end of said crankshaft 45 is the drive pulley 59, connected by the belt 60 to a suitable source of power. Attached to the pulley 59 is the cam 6|, upon which rides the cam roller 62 attached to the link 63, secured to the shaft 64, upon whose outer end is mounted the arm 65, carrying the pawl 66 in contact with the teeth 33 of the index bar 32.

As illustrated in Fig. 6, I have shown a special form of bushing Ma and 49a for bearings ll and 40, respectively, each of said bushings being tapered in form and slotted on one side in order to permit longitudinal adjustment thereof by the adjusting screws Mb and 4%, respectively, engaging with the walls of bushings M a and 40a, so that when the said bushings become worn they may be adjusted to take up the wear of the shaft 42 thereof. Also in Fig. 5, I have shown spring 51 affixed by the pin 68 to the bearing ll, the free end of said spring being located so as to make engaging contact with the saw 52 and to hold,

securely the same in operative position.'

Also in Fig. 8, I have shown the die 69 and the holding means therefor comprising the channeled and flanged casting 10 and clamp H secured thereto by the cap screws 72 and set screw 13. As further shown in Figs. 4 and 5 the said holding means for the die 69 also comprises the cap plate 14 secured to said flange H! by the capscrews 75. Also the die 69 is shown preferably made of two separated parts, or pieces, 69a and 69b, adjusting screws 16, threaded to engage with openings provided therefor in said plate 14, and in contact with the lower ends of said parts, serving to adjust the same upwardly or downwardly as may be required.

To operate my improved apparatus, the hand saw '52 is secured to the carriage l8, by means ofclam'ps 25, 21 and 28; and the toothed edge thereof, or edge in which the teeth are to be cut, placed in operative position on bar I! so that said edge will be centered in respect to the middle of the top of said bar l1, and positioned to slide thereon. At the same time, there is installed in the groove 29, the index bar 32 having the number of teeth in the spacing required. Thereupon the arms of the clamps 36 are manually released from bosses 36a upon the carriage member 20, and the shoes 3'! brought into yielding sliding contact with the rail l5. Then power being applied through the connection of the belt 60 with pulley 59, the aforesaid punch mechanism is started in operation, and the teeth punched in the edge of the saw blade in the same manner as that used by the ordinary punch, as well understood in the art, greatly aided and assisted, however, by my new rocker system of operation of said punch and the novel positive mechanical stripper, each hereinbefore more particularly described; the rocker system comprising arm 53 and laterally connected mechanism for operating the same and the said stripper comprising the arm 49 and finger 5! serving intermittently to hold the edge of the saw rigidly to the die solely while the punch is cutting a tooth, and while the punch is being withdrawn from the cut thereof.

In feeding the saw through the apparatus so that the teeth are regularly cut by the punch, one tooth at a time, the action of the apparatus is as follows: As the pulley 59 revolves the movement of cam 6| causes the cam roll 62 to move back and forth through a narrow arc, the link 63, and thereby to oscillate the shaft 64, whose outer end is connected with arm 65, upon which is pivotally mounted the pawl 66 in contact with the teeth 33 of the index bar 32, with the result that with every revolution of the pulley 53 the said bar is advanced one tooth carrying the carriage therewith, and upon the carriage coming to rest, the punch is timed to punch one tooth out of the edge of the saw.

My invention may be embodied in other specific"forms without departing from the spirit or essential characteristics thereof. The present embodiment, as above set forth, is therefore to be considered in all respects as illustrative and not restrictive, the scope of my invention being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

'What I claim and desire to secure by Letters Patent is 1. In apparatus of the character described, a base, a carriage for a hand saw mounted to slide upon said base,'index means affixed to said carriage and operable to advance said saw through the space required to form a single tooth, a rockirig' arm carrying a punch and a die adjustably mounted upon said base and located to contact the edge of the blade of said saw, said punch being secured in a socket upon said arm by pressure of set screws and gibbs adjustably fastened to the inner wall thereof, and mechanism cooperating with said index means and said punch and die for cutting successive teeth in the edge of said saw. I

2, In apparatus for cutting teeth in handsaws, the combination of a base; rails forming a track horizontally secured to the top of said base; a carri ge for said hand saw mounted to sl de upon said track; an equally spaced toothed index bar removably afiixed to said carriage; a pawl mounted upon said base and operatively engaging with theteeth of said bar; means connected with said base for actuating said pawl and for moving said carriage the space of one tooth of said bar; an arm pivotally mounted upon a shaft journalled in longitudinally adjustable tapered bushings within bearings secured to said base; a punch adjustably secured in upright position to. one end of said arm; and a die mounted upon said base and positioned to engage with said punch; said arm cooperating with said index means for cutting one tooth at a time in regular continuous spaced succession from the edge of said saw.

3. In apparatus for cutting teeth in handsaws,

thecombination of a base; rails forming a'track horizontally secured to the top of said base; a carriage for said hand saw mounted to slide upon said track; an equally spaced toothed index bar removably afiixed to said carriage; a pawl mounted upon said base and operativelyengaging with the teeth of said bar; means connected withsaid base for actuating said pawl and for moving said carriage the space of one tooth of said bar; mech anism comprising an arm pivotally mounted upon a shaft journalled in longitudinally adjustable tapered bushings within bearings secured to said base; a punch adjustably secured in upright position to one end of said arm; a die mounted upon said base and positioned to engage with said punch; said arm cooperating with said index means for cutting one tooth at a time in regular continuous spaced succession from the edge of said saw; and intermittently mechanically operable stripper means connected with said arm for holding the edge of said saw rigidly to the die solely while the punch is cutting a tooth and while being withdrawn from the cut thereof.

4. In apparatus for cutting teeth in handsaws, the combination of a base; rails forming a track horizontally secured to the top of said base; a carriage for said hand saw mounted to slide upon said track; an equally spaced toothed index bar removably affixed to said carriage; a pawl mounted upon said base and operatively engaging with the teeth of said bar; means connected with said base for actuating said pawl and for moving said carriage the space of one tooth of said bar; mechanism comprising an arm pivotally mounted upon a shaft journalled in longitudinally adjustable tapered bushings within bearings secured to said base; a punch adjustably secured in upright postion to one end of said arm; a two piece die mounted upon said base and positioned to engage with said punch, each piece of said die being independently longitudinally adjustable in respect to the other, and said arm cooperating with said index means for cutting one tooth at a time in regular continuous spaced succession from the edge of said saw; and intermittently mechanically operable stripper means connected with said arm for holding the edge of said saw rigidly to the die solely while the punch is cutting a tooth, and while being withdrawn from the cut thereof.

5. In apparatus for cutting teeth in handsaws, the combination of a hollow base rectangular in form; a plate firmly mounted upon said base; rails forming a track horizontally secured to the top of said plate; a carriage for said hand saw mounted to slide upon said track and having shoes in spring yielding sliding engagement with one of said rails; an equally spaced toothed index bar removably aflixed to said carriage; a pawl mounted upon said base and operatively engaging with the teeth of said bar; means connected with said base for actuating said pawl and for moving said carriage the space of one tooth of said bar; mechanism comprising an arm pivotally mounted upon a shaft journalled in longitudinally adjustable tapered bushings within bearings secured to said base; a punch adjustably secured in upright position to one end of said arm; a two piece die mounted upon said base and positioned to engage with said punch; each piece of said die being independently longitudinally adjustable in respect to the other, and said arm cooperating with said index means for cutting one tooth at a time in regular continuous spaced succession from the edge of said saw; and intermittently mechanically operable stripper means connected with said arm for holding the edge of said saw rigidly to the die solely while the punch is cutting a tooth, and while being withdrawn from the cut thereof.

BYRON G. DAGGETT.

REFERENCES CITED The following references are of record in the file of this patent:

' UNITED STATES PATENTS 

